This paper discusses the features of transaction cost economics (TCE): asset specificity, governance mechanism, prior ties; and to consider resource-based view theory together, how OEM suppliers in LCD monitor and Industrial PC (IPC) industries deal with their customers in accordance with transaction cost theory. OEM suppliers have some key activities in the product or project development schedule. The features of TCE will impact the managers to make decisions on the necessity of unilateral investments without the commitments from the customers; and how much to invest in these key activities to secure current business and to expand the business scale. The findings state OEM suppliers in IPC industry implicitly follow TCE on investments in accordance with customers’ requests. In LCD monitor assembly industry, due to limited supplier selection and less product design deviation, OEM suppliers could be willing to offer unilateral investments upon the business consideration.